On Sat, Dec 11, 2010 at 10:14 PM, Peter Barada <peterb@xxxxxxxxxxx> wrote: > I'm trying to add code to a 2.6.32 kernel to extract the OMAP core > temperature for thermal testing, and section 7.4.6 of the OMAP3 TRM > (spug98g.pdf) explains the CONTROL_TEMP_SENSOR register. I have not look at it further but there is some code at http://thread.gmane.org/gmane.linux.ports.arm.omap/8424/focus=8514. Hope this helps! Jean > > I've added the following code: > > static void omap3logic_fetch_temp(char *temp_buf) > { > int temp_val; > unsigned int temp; > static short temp_table[] = { > -400, -400, -400, -400, -400, > -400, -389, -375, -361, -333, /* 0-9 */ > -318, -304, -290, -275, -261, > -247, -233, -219, -205, -191, /* 10-19 */ > -177, -163, -149, -134, -120, > -106, -92, -78, -64, -50, /* 20-29 */ > -35, -21, -7, +8, +23, > +37, +51, +66, +80, +94, /* 30-39 */ > +108, +123, +137, +151, +165, > +179, +194, +208, +222, +236, /* 40-49 */ > +251, +265, +279, +293, +307, > +321, +335, +349, +364, +378, /* 50-59 */ > +392, +406, +420, +424, +449, > +463, +447, +491, +505, +519, /* 60-69 */ > +533, +546, +560, +574, +588, > +602, +616, +630, +644, +657, /* 70-79 */ > +671, +685, +699, +713, +727, > +741, +755, +769, +783, +797, /* 80-89 */ > +811, +823, +838, +852, +865, > +879, +893, +906, +920, +934, /* 90-99 */ > +947, +961, +975, +989, +1002, > +1016, +1030, +1043, +1057, +1071, /* 100-109 */ > +1085, +1098, +1112, +1126, +1140, > +1153, +1167, +1181, +1194, +1208, /* 110-119 */ > +1222, +1235, +1249, +1250, +1250, > +1250, +1250, +1250, +1250, /* 120-128 */ > }; > > temp = omap_ctrl_readl(OMAP343X_CONTROL_TEMP_SENSOR); > > temp_val = (temp_table[temp&0x7f] + temp_table[(temp&0x7f)+1]) / 2; > sprintf(temp_buf, "%d.%1d (%02x)", temp_val/10, ((unsigned > int)temp_val)%10, temp); > } > > static ssize_t > omap3logic_show_temp(struct class *class, char *buf) > { > ssize_t retval; > char temp[128]; > > omap3logic_fetch_temp(temp); > retval = sprintf(buf, "%s\n", temp); > return retval; > } > > static struct class_attribute temp_attr = > __ATTR(temp, S_IRUGO, omap3logic_show_temp, NULL); > > static struct class *omap3logic_temp_class; > > void omap3logic_temp_init(void) > { > int rc; > > omap3logic_temp_class = class_create(THIS_MODULE, "temp"); > if (IS_ERR(omap3logic_temp_class)) { > printk(KERN_ERR "%s: couldn't create temp class\n", __FUNCTION__); > return; > } > rc = class_create_file(omap3logic_temp_class, &temp_attr); > if (unlikely(rc)) { > printk(KERN_ERR "%s: couldn't create temp class file\n", > __FUNCTION__); > return; > } > > /* Set CONTCONV and SOC to start continuous temperature measurements */ > omap_ctrl_writel(0x300, OMAP343X_CONTROL_TEMP_SENSOR); > } > > But when I read the register back, I see only a fixed temperature value, > even if I fire up some video demos to crank up the load. If I reboot I'll > see the temperature jump up, but then it stays constant whether I > increase/decrease the CPU load. > > Any ideas why this isn't working? > > Thanks in advance! > > -- > Peter Barada > peterb@xxxxxxxxxxx > > -- > To unsubscribe from this list: send the line "unsubscribe linux-omap" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
